Articlebronze2005

Mass determinations of a 1 kg silicon sphere for the Avogadro project

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Scientific Measurement and Uncertainty Evaluation Advanced Measurement and Metrology Techniques Advanced Electrical Measurement Techniques

Abstract

For a new determination of the Avogadro constant to play a role in the redefinition of the mass unit, the BIPM and other laboratories must carry out mass comparisons at a very high level of accuracy. We must achieve mass comparison among a 1 kg 28 Si sphere and 1 kg Pt/Ir mass standards to a combined standard uncertainty of 4 µg. The BIPM has developed a method to reach the target requested by the Avogadro group. The goal of this paper is to report the advances at the BIPM and to describe our new method for linking between weighings in air and in vacuum. The results obtained by classical comparisons in air are compared with those obtained by the new BIPM method.

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References

1992Equation for the Determination of the Density of Moist Air (1981/91)1982Equation for the Determination of the Density of Moist Air (1981)2003Determination of the Avogadro constant via the silicon route 2004Methods to determine water vapour sorption on mass standards 2004Determination of the amount of gas adsorption on SiO2/Si(100) surfaces to realize precise mass measurement 2004A redetermination of the argon content of air for buoyancy corrections in mass standard comparisons 2002Three methods of determining the density of moist air during mass comparisons 2004The BIPM flexure-strip balance FB-2

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2007On the role of the Avogadro constant in redefining SI units for mass and amount of substance 2013Current State of Avogadro ${}^{28}$Si sphere S8 2006Primary mass calibration of silicon spheres

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